Mr Keogh earlier had been drinking at a Christmas party and fell asleep outdoors, in just his underwear and one sock, until mounted police woke him.

The man's lawyer Con O'Neill said his client had alcohol problems for which he had sought treatment.

He said his client loved horses and was humiliated by his actions.

"He's humiliated every time he leaves this court," Mr O'Neill said.

Mr Keogh, who is from Ireland, wants to apply for permanent residency for his family.

"It's not suggested in this case that there was any demonstrable harm cause to the horse, although it must have been discomforted," the magistrate said.

"December last year was a difficult time for you because you and your partner lost a child in very tragic circumstances in December 2010, so I understand when December comes around every year it's very sad."

Mr Keogh was put on a 15-month good behaviour bond of $600 and ordered to pay legal costs.